Raised fluid even breaking metal (8)
I believe the answer is:
leavened
'raised' is the definition.
(leavening is a kind of raising)
'fluid even breaking metal' is the wordplay.
'fluid' is an anagram indicator.
'breaking' indicates putting letters inside.
'metal' becomes 'lead' (lead is a kind of metal**).
'even' is an anagram of 'vene'.
'vene' put within 'lead' is 'LEAVENED'.
(Other definitions for leavened that I've seen before include "With substance added that produces fermentation in dough" , "Of bread, containing substance that causes fermentation in dough" , "made to rise" , "transformed for the better?" , "In a ferment" .)